Steven J. Cooke, Vivian M. Nguyen, Steven T. Kessel, Nigel E. Hussey, Nathan Young, Adam T. Ford

Developments in electronic tagging and tracking, including biotelemetry and biologging, have provided unprecedented insight into the ecology of wild animals (Cooke et al. 2004) and revealed hidden movement patterns, habitat associations, animal-environment interactions, and mortality rates for even the most cryptic of species (Hussey et al. 2015; Kays et al. 2015). Natural history, ecology (including movement ecology), conservation, and resource management have all benefitted from the application of this technology. Yet, as use of electronic tagging in research and public awareness of this technology has increased, a number of troubling and unanticipated issues have emerged. We submit that these issues need to be addressed proactively by the diverse range of people involved in animal-tracking studies - manufacturers, funders, researchers, and animal-care committees. Ignoring these issues may have serious negative consequences for individual animals, animal populations, conservation, and the future use, regulation, and public perception of electronic tracking. We recount examples of such issues in freshwater, marine, and terrestrial realms. We did not consider issues related to the effects of capturing and fitting animals with tracking devices; these are discussed at length elsewhere (e.g., Wilson and McMahon 2006; Cooke et al. 2013). This article is protected by copyright. All rights reserved.